Design
The distinctive low-aspect ratio lateen sail gives the Sunfish an anachronistic appearance compared with today's more familiar high-aspect ratio Bermuda rig sailboats. However, this sail plan is not as old-world as it might first appear. Using a lateen rig for this style boat shifts the advantage toward better performance in lighter air (less than 4 on the Beaufort scale) and contributes to it having good down-wind characteristics.
The hull’s very mild "V" bottom and hard chine make Sunfish a most stable boat for its size, along with enabling it to sail on a plane (hydroplane). Planing allows the boat to achieve a speed greater than theoretical hull speed based on length at waterline (LWL). Having a down-wind performance advantage helps the Sunfish to achieve a planing attitude at lower wind speeds than its high-aspect ratio sail plan counterparts.
Designed as a water-tight, hollow-body pontoon, a hull like the Sunfish has is sometimes referred to as "self-rescuing" because the boat can be capsized and its cockpit swamped without threat of the boat sinking.
Read more about this topic: Sunfish (sailboat)
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